US11184789B2 - Method and device for measuring and reporting signal in wireless communication system - Google Patents

Method and device for measuring and reporting signal in wireless communication system Download PDF

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US11184789B2
US11184789B2 US16/630,093 US201816630093A US11184789B2 US 11184789 B2 US11184789 B2 US 11184789B2 US 201816630093 A US201816630093 A US 201816630093A US 11184789 B2 US11184789 B2 US 11184789B2
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transmission
reception
beams
transmission beam
base station
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US20200162954A1 (en
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Inkwon Seo
Kijun KIM
Yunjung Yi
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LG Electronics Inc
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LG Electronics Inc
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
    • H04B7/0695—Hybrid systems, i.e. switching and simultaneous transmission using beam selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0868—Hybrid systems, i.e. switching and combining
    • H04B7/088—Hybrid systems, i.e. switching and combining using beam selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026—Transmission of channel quality indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0055—Physical resource allocation for ACK/NACK
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/001—Synchronization between nodes
    • H04W72/042—
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/046—Wireless resource allocation based on the type of the allocated resource the resource being in the space domain, e.g. beams
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/22—Processing or transfer of terminal data, e.g. status or physical capabilities
    • H04W8/24—Transfer of terminal data

Definitions

  • the present disclosure relates to a wireless communication system, and more particularly, to a method of measuring and reporting multiple transmission beams in a wireless communication system and device therefor.
  • a user equipment performs an initial cell search (S 101 ).
  • the UE receives a Primary Synchronization Channel (P-SCH) and a Secondary Synchronization Channel (S-SCH) from a base station (BS), performs downlink synchronization with the BS, and acquires information such as a cell ID.
  • the UE acquires system information (e.g., MIB) through a PBCH (Physical Broadcast Channel).
  • MIB Physical Broadcast Channel
  • the UE can receive the DL RS (Downlink Reference Signal) and check the downlink channel status.
  • DL RS Downlink Reference Signal
  • the UE can acquire more detailed system information (e.g., SIBs) by receiving a Physical Downlink Control Channel (PDCCH) and a Physical Downlink Control Channel (PDSCH) scheduled by the PDCCH (S 102 ).
  • SIBs system information
  • PDCCH Physical Downlink Control Channel
  • PDSCH Physical Downlink Control Channel
  • the UE may perform a random access procedure for uplink synchronization.
  • the UE transmits a preamble (e.g., Msg 1 ) through a physical random access channel (PRACH) (S 103 ), and receives a response message (e.g., Msg 2 ) for the preamble through PDCCH and PDSCH corresponding to the PDCCH.
  • a contention resolution procedure such as additional PRACH transmission (S 105 ) and PDCCH/PDSCH reception (S 106 ) may be performed.
  • the UE can perform PDCCH/PDSCH reception (S 107 ) and Physical Uplink Shared Channel (PUSCH)/Physical Uplink Control Channel (PUCCH) transmission (S 108 ) as a general uplink/downlink signal transmission procedure.
  • the UE can transmit UCI (Uplink Control Information) to the BS.
  • the UCI may include HARQ ACK/NACK (Hybrid Automatic Repeat reQuest Acknowledgment/Negative ACK), SR (Scheduling Request), CQI (Channel Quality Indicator), PMI (Precoding Matrix Indicator) and/or RI etc.
  • the object of the present disclosure is to provide a method by which a UE measures and reports multiple transmission beams to support multi-beam operation for a PDCCH signal in a wireless communication system and device therefor.
  • a method of measuring and reporting a beam by a UE in a wireless communication system may include: measuring multiple transmission beams for a PDCCH with one or two or more reception beams; determining at least one transmission beam to report to a BS based on results of measuring the multiple transmission beams; and transmitting a measurement report including information on the determined at least one transmission beam to the BS.
  • the UE may identify a reception beam applied to each of the determined at least one transmission beam and report the index of a synchronization signal block available on the identified reception beam to the BS through the measurement report.
  • the UE may include a transceiver; and a processor configured to control the transceiver to measure multiple transmission beams for a PDCCH with one or two or more reception beams, determine at least one transmission beam to report to a BS based on results of measuring the multiple transmission beams, and transmit a measurement report including information on the determined at least one transmission beam to the BS.
  • the processor may be configured to identify a reception beam applied to each of the determined at least one transmission beam and report the index of a synchronization signal block available on the identified reception beam to the BS through the measurement report.
  • the UE may report, to the BS, UE capability related to the number of reception beams capable of being formed simultaneously.
  • the at least one transmission beam to be reported by the UE may correspond to a transmission beam in excess of a threshold among transmission beams capable of being received through one reception beam.
  • the at least one transmission beam to be reported by the UE may include multiple transmission beam sets respectively corresponding to different reception beams.
  • the UE may determine to report, to the BS, a transmission beam with quality higher than a threshold.
  • the threshold may be determined depending on whether a resource for measurement is a synchronization signal block or a channel state information-reference signal (CSI-RS).
  • CSI-RS channel state information-reference signal
  • the measurement report may further include information on a reception beam paired with each of the determined at least one transmission beam.
  • the UE may receive a data signal scheduled by the PDCCH and transmit a message including ACK/NACK information for the data signal.
  • the message may further include information on a transmission beam for transmitting a PDCCH capable of being received by the UE among the multiple transmission beams.
  • a UE may measure/report transmission beams suitable for PDCCH reception, and thus transmission beams to be used for multi-beam operation may be determined accurately and efficiently.
  • the multi-beam operation is applied to a PDCCH signal, the probability of success of PDCCH transmission and reception may increase, and diversity gain may also be obtained.
  • FIG. 1 illustrates physical channels used in a 3GPP LTE/LTE-A system and a general signal transmission method using the physical channels.
  • FIG. 2 is a diagram for explaining multi-beam operation for a control channel according to an embodiment of the present disclosure.
  • FIG. 3 is a flowchart illustrating a signal transmission and reception method according to an embodiment of the present disclosure.
  • FIG. 4 illustrates a base station (BS) and a user equipment (UE) according to an embodiment of the present invention.
  • CDMA code division multiple access
  • FDMA frequency division multiple access
  • TDMA time division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single carrier frequency division multiple access
  • CDMA can be implemented with such a radio technology as UTRA (universal terrestrial radio access), CDMA 2000 and the like.
  • TDMA can be implemented with such a radio technology as GSM/GPRS/EDGE (Global System for Mobile communications)/General Packet Radio Service/Enhanced Data Rates for GSM Evolution).
  • OFDMA can be implemented with such a radio technology as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, E-UTRA (Evolved UTRA), etc.
  • UTRA is a part of UMTS (Universal Mobile Telecommunications System).
  • 3GPP (3rd Generation Partnership Project) LTE (long term evolution) is a part of E-UMTS (Evolved UMTS) that uses E-UTRA.
  • 3GPP LTE adopts OFDMA in downlink and adopts SC-FDMA in uplink.
  • LTE-A LTE-Advanced
  • LTE-A LTE-Advanced
  • 3GPP LTE system or 3GPP LTE-A system, by which the technical idea of the present invention may be non-limited.
  • Specific terminologies used in the following description are provided to help understand the present invention and the use of the terminologies can be modified to a different form within a scope of the technical idea of the present invention.
  • eMBB enhanced mobile broadband
  • RAT legacy radio access technology
  • massive machine type communications for connecting a plurality of devices and objects to provide various services anytime and anywhere is also one of factors to be considered in next-generation communication.
  • UE service/user equipment
  • URLLC ultra-reliable and low latency communication
  • New RAT may also be applied to new RAT.
  • new RAT may be referred to as 5G mobile communication.
  • downlink (DL) and downlink (UL) transmission may be performed through frames having duration of 10 ms and each frame may include 10 subframes. Accordingly, 1 subframe may correspond to 1 ms. Each frame may be divided into two half-frames.
  • N symb slot represents the number of symbols per slot
  • ⁇ represents OFDM numerology
  • N slot subframe, ⁇ represents the number of slots per subframe with respect to corresponding u.
  • multiple OFDM numerologies shown in Table 1 below may be supported.
  • ⁇ f refers to subcarrier spacing (SCS).
  • SCS subcarrier spacing
  • ⁇ and cyclic prefix with respect to a DL carrier bandwidth part (BWP) and u and cyclic prefix with respect to a UL carrier BWP may be configured for a UE via UL signaling.
  • Table 2 below shows the number of N symb slot of symbols per slot, the number N slot frame, ⁇ of symbols per frame, and the number N slot subframe, ⁇ of slots per subframe with respect to each SCS in the case of normal CP.
  • Table 3 shows the number N symb slot of symbols per slot, the number N slot frame, ⁇ of slots per frame, and the number N slot subframe, ⁇ of slots per subframe with respect to each SCS in the case of extended CP.
  • the number of slots included in 1 subframe may be changed according to subcarrier spacing (SCS).
  • OFDM symbols included in each slot may correspond to any one of D (DL), U (UL), and X (flexible).
  • DL transmission may be performed in a D or X symbol and UL transmission may be performed in a U or X symbol.
  • a Flexible resource e.g., X symbol
  • one resource block may correspond to 12 subcarriers in the frequency domain.
  • a RB may include a plurality of OFDM symbols.
  • a resource element may correspond to 1 subcarrier and 1 OFDM symbol. Accordingly, 12 REs may be present on 1 OFDM symbol in 1 RB.
  • a carrier BWP may be defined as a set of contiguous physical resource blocks (PRBs).
  • the carrier BWP may also be simply referred to a BWP.
  • a maximum of 4 BWPs may be configured for each of UL/DL link in 1 UE. Even if multiple BWPs are configured, 1 BWP may be activated for a given time period. However, when a supplementary uplink (SUL) is configured in a UE, 4 BWPs may be additionally configured for the SUL and 1 BWP may be activated for a given time period.
  • SUL supplementary uplink
  • a UE may not be expected to receive a PDSCH, a PDCCH, a channel state information-reference signal (CSI-RS), or a tracking reference signal (TRS) out of the activated DL BWP.
  • the UE may not be expected to receive a PUSCH or a PUCCH out of the activated UL BWP.
  • a transmission unit of a control channel may be defined as a resource element group (REG) and/or a control channel element (CCE), etc.
  • the CCE may refer to a minimum unit for control channel transmission. That is, a minimum PDCCH size may correspond to 1 CCE.
  • a network may group a plurality of CCEs to transmit one PDCCH (i.e., CCE aggregation).
  • An REG may correspond to 1 OFDM symbol in the time domain and may correspond to 1 PRB in the frequency domain.
  • 1 CCE may correspond to 6 REGs.
  • the CORESET may be a set of resources for control signal transmission and the search space may be aggregation of control channel candidates for perform blind detection.
  • the search space may be configured for the CORESET.
  • a CORESET for a common search space (CSS) and a CORESET for a UE-specific search space (USS) may each be configured.
  • a plurality of search spaces may be defined in one CORESET.
  • the CSS and the USS may be configured for the same CORESET.
  • the CSS may refer to a CORESET with a CSS configured therefor and the USS may refer to a CORESET with a USS configured therefor, or the like.
  • An eNB may signal information regarding a CORESET to a UE.
  • a CORESET configuration for each CORESET may be signaled to the UE, and the CORESET configuration may be signaled in time duration (e.g., 1/2/3 symbol) of the corresponding CORESET, a frequency domain resource of the corresponding CORESET, precoder granularity, an REG-to-CCE mapping type (e.g., interleaved/non-Interleaved), a REG bundling size and an interleaver size in the case of an interleaved REG-to-CCE mapping type, and so on.
  • time duration e.g. 1/2/3 symbol
  • an REG-to-CCE mapping type e.g., interleaved/non-Interleaved
  • REG bundling size e.g., interleaved/non-Interleaved
  • REG-to-CCE mapping with respect to 1-symbol CORESET is a non-interleaved type
  • 6 REGs with respect to a CCE are grouped to one REG bundle and all REGs of the corresponding CCE may be contiguous.
  • CCEs may also be contiguous.
  • a UE may assume the same precoding in 1 REG bundle or may assume the same precoding with respect to a plurality of REG bundles.
  • 2, 3, or 6 REGs may configure 1 REG bundle.
  • all REG bundle sizes of 2, 3, and 6 are not supported but, as a subset thereof, for example, an REG bundle size of ⁇ 2 ⁇ , ⁇ 3 ⁇ , ⁇ 2,3 ⁇ , ⁇ 2,6 ⁇ , ⁇ 3,6 ⁇ , or ⁇ 2,3,6 ⁇ may be supported.
  • an REG bundle size of ⁇ 2, 6 ⁇ is supported, 2 REGs may configure 1 REG bundle or 6 REGs may configure 1 REG bundle.
  • a UE may assume the same precoding in 1 REG bundle or may assume the same precoding with respect to a plurality of REGs according to precoder granularity.
  • a REG bundle may be defined in time/frequency domain.
  • all REGs belonging to 1 REG bundle may belong to the same RB and may correspond to different symbols.
  • 1 REG bundle may include REGs belonging to different RBs as well as REGs that belong to the same RB and correspond to different symbols.
  • Time-first mapping may be supported for REG-to-CCE mapping with respect to a CORESET having duration of 2 symbols or greater.
  • An REG bundle may be supported to be configured on the time domain in the same way as time domain duration of a CORESET.
  • 6 REGs included in a CCE may correspond to 1 REG bundle and REGs of the corresponding CCE may be localized in the time/frequency domain.
  • 2, 3, or 6 REGs may correspond to 1 REG bundle and REG bundles may be bundled in a CORESET.
  • a UE may assume the same precoding in 1 REG bundle or may assume the same precoding with respect to a plurality of REGs according to precoder granularity.
  • multiple analog beams may be used for transmission and reception.
  • a UE may apply the best reception beam when receiving the signal.
  • Multiple beams may be used for a control channel.
  • the introduction of control channel transmission and reception on multiple beams is considered for the following reasons.
  • control channel since there is no preprocessing for informing the control channel transmission and reception, it is difficult to perform a HARQ procedure on a data channel Thus, it may be required to obtain transmit diversity gain using multiple beams to avoid transmission and reception failure due to blockage.
  • one REG includes one symbol and one PRB (i.e., 12 REs including an RS).
  • a CCE which is the minimum transmission unit of the control channel, includes 6 REGs. Accordingly, a bandwidth of about 10 MHz is required to transmit control information at aggregation level 8 in one symbol.
  • control channel capacity may become insufficient.
  • there are multiple analog beams for the control channel if the UE monitors the multiple analog beams, it is advantageous in that the flexibility of network beam scheduling is improved and the control channel capacity increases.
  • multiple beams may be used for the control channel.
  • a description will be given of how a UE performs measurement and reporting regarding multi-beam operation for a control channel and feeds back information on a transmission beam.
  • Synchronization signal (SS) block selection During a synchronization procedure, a UE may select an SS block based on measurement results of a PSS/SSS, a PBCH (and/or a DMRS on the PBCH), etc. and perform initial access using initial access related information transmitted on the PBCH in the selected SS block.
  • SS Synchronization signal
  • the network may allocate multiple transmission beams to the UE based on the beam direction of the selected SS block (e.g., the transmission beams are indicated by SS block (SSB) indexes and/or CSI-RS ports) and instruct the UE to perform measurement/reporting to select a transmission beam (or a serving beam).
  • SSB SS block indexes and/or CSI-RS ports
  • the UE may perform the measurement using different reception beams for one same transmission beam. This operation may be referred to as beam management.
  • the UE may perform the beam management periodically to determine its serving beam.
  • each transmission beam is allocated as a CSI-RS port.
  • each transmission beam is allocated as the CSI-RS port, it may be interpreted to mean that a different CSI-RS port is allocated for each transmission beam.
  • the present disclosure is not limited thereto, and a transmission beam may be specified by an SSB index and/or a transmission beam index.
  • the UE may report measurement results according to the following methods.
  • the measurement and reporting may be defined in different ways depending on the purpose of transmission beams or a transmission beam group.
  • the transmission beams or transmission beam group may be defined in the following ways: (i) to (iii).
  • the network may signal to the UE which one of the definitions (i) to (iii) is applied.
  • the UE When it is said that the UE is capable of simultaneously receiving multiple transmission beams, it may mean that the UE is capable of receiving the multiple transmission beams using the same reception beam or by simultaneously forming multiple reception beams (e.g., by matching a transmission beam and a reception beam). In the latter case, a reception beam may be reported together with a transmission beam for each sub-group of the transmission beam group.
  • the transmission beams reported by the UE may refer to a set of transmission beams capable of being received simultaneously in a specific CORESET.
  • the transmission beams reported by the UE may refer to a set of transmission beams capable of being received simultaneously by the UE on a specific time-domain resource (e.g., OFDM symbol).
  • the UE may report to the network the number of simultaneously applicable reception beams (e.g., in the form of UE capability).
  • the UE may report the number of simultaneously applicable reception beams and at the same time, report a transmission beam set capable of being received through each reception beam.
  • the UE may report multiple preferred transmission beam sets, and in this case, each preferred transmission beam set may be received in different reception beam sets.
  • the transmission beams reported by the UE may be defined as follows depending on the number of reception beams that the UE is capable of applying simultaneously.
  • the transmission beams reported by the UE may refer to a set of transmission beams capable of being received simultaneously by the UE on a specific time/frequency resource
  • the network may change the transmission beams in a UE-transparent way for UE multiplexing.
  • Each UE may perform operation for a transmission beam associated therewith. For example, when the network signals that transmission beams #a and #b are available for a specific slot set, UE 1 monitoring transmission beam #a may use a reception beam suitable for transmission beam #a, and UE 2 monitoring transmission beam #b may use a reception beam suitable for transmission beam #b for the monitoring. In this case, the network may use either transmission beam #a or #b.
  • the network may use both transmission beams #a and #b.
  • the network may inform each UE of a transmission beam that each UE needs to monitor.
  • the network may use the UE's report on its transmission beam set in determining which CSS beam and which USS beam the network is capable of multiplex on one resource for a CORESET including both the CSS and the USS.
  • an SSB may be quasi-co-located (QCLed) with a CSS transmission/reception beam.
  • a transmission/reception beam used in the SSB may be used in the CSS in the same manner.
  • the UE may use a reception beam different from that used in general beam measurement. For example, when measuring a transmission beam, the UE may use a set of reception beams which the UE uses in monitoring an SSB. Thus, a CSI-RS corresponding to one transmission beam may be repeatedly transmitted such that the transmission beam is used for multiple reception beams. If the CSI-RS is transmitted such that it is monitored on the multiple reception beams and there are separate reception beams for measuring a transmission beam set, the UE may report to the network the number of times that the transmission beam is swept/repeated, which is necessary for the measurement, by considering the reception beams. Such a report may be related to a UE's report on its reception beam capability. The UE's report on its reception beam capability may be interpreted to mean that for the same CSI-RS, the UE requests the network to repeatedly transmit the CSI-RS at least as many times as the number of reception beams.
  • the UE may operate as follows when measuring/reporting a transmission beam.
  • a threshold used in measurement for beam sharing between the CSS/USS or a threshold used in measurement with respect to the SSB may vary as follows.
  • the UE may apply a different control channel and a different resource for each measurement RS and reception beam set.
  • the reason for this is that the UE may have different quality standards for the CSS and the USS.
  • R1 denotes a reception beam set for beam management (e.g., a reception beam set applied to a CSI-RS, a TRS, etc.) and R2 denotes a reception beam set for SSB monitoring
  • the following options may be considered to measure/report a transmission beam group.
  • the network may configure whether the UE needs to perform the measurement and reporting based on either or both R1 and R2.
  • information on an SSB may be added to a UE's measurement report.
  • the UE may also report an SSB that the UE may receive though a reception beam used in receiving a transmission beam to be reported.
  • the UE may additionally report the index of an SSB the UE is capable of receiving through a reception beam used in receiving the corresponding transmission beam group.
  • CSI-RS ports may be used to measure the SSB.
  • two types of CSI-RS ports may be used for the beam management.
  • the two types of CSI-RS ports may include a Type-1 CSI-RS port (e.g., a CSI-RS port for SSB measurement) and a Type-2 CSI-RS port (e.g., a CSI-RS port for transmission beam measurement).
  • the UE may perform measurement separately for each type of CSI-RS port, and measurement standards may also be separately configured.
  • the SSB information may be used to configure the CSS.
  • the CSS may be used for transmission and reception of common control information or fallback operation for the USS.
  • information needs to be provided to multiple UEs, and thus, a wide beam is required. That is, the beam needs to have a width suitable for the SSB.
  • multiple transmission beams may be used for NR-PDCCH transmission and reception.
  • multiple transmission beams for transmitting an NR-PDCCH to a specific UE may be defined as a serving beam group.
  • the network may inform the UE whether a single or multiple transmission beams are used for a specific CORESET.
  • the network may transmit the configurations of the multiple transmission beams to the UE.
  • the transmission beam may be configured for each resource unit (e.g., a REG, a CCE, a candidate, a symbol, etc.).
  • the definition of a serving beam may become narrower than that of the serving beam group.
  • the serving beam may refer to a specific transmission beam where CSI measurement is performed.
  • both UE-dedicated beamforming and precoder cycling may be applied to the serving beam
  • only the precoder cycling may be applied.
  • the network may configure a different transmission beam to be assumed for each specific REG, CCE, candidate, and symbol.
  • the UE may apply different reception beams.
  • multiple transmission beams may be used in the same CORESET regardless of UE capability (i.e., whether the UE is capable of simultaneously managing multiple reception beams).
  • UE capability i.e., whether the UE is capable of simultaneously managing multiple reception beams.
  • one control channel candidate is configured by combining REGs or CCEs located at different symbols
  • a different transmission beam may be used for each of the resources constituting the corresponding control channel candidate.
  • the UE may receive the control channel candidate using an appropriate reception beam for each resource (e.g., symbol).
  • the multi-beam transmission (operation) may be applied only when the UE is capable of simultaneously managing multiple reception beams.
  • the UE may obtain one control channel candidate by extracting REGs, CCEs, and the like constituting a specific control channel candidate from a signal received through each reception beam.
  • the UE may report its preferred transmission beam. For example, the UE may report at least one transmission beam group or at least one transmission/reception beam pair. In addition, the UE may report its capability on whether the UE is capable of applying reception beams simultaneously. If the UE is capable of applying one reception beam at a specific time instance, the UE may report a transmission beam group that the UE is capable of receiving through the corresponding reception beam (e.g., a transmission beam group in excess of a threshold after measurement based on the corresponding reception beam). Additionally, the UE may report a reception beam associated with its preferred transmission beam.
  • the UE may report transmission beam groups in excess of a threshold based on measurement results, which are made in combination of transmission and reception beams, with no reception beam. Alternatively, the UE may report a transmission beam group in excess of the threshold for each reception beam. Further, the UE may report SSB information. When the UE performs measurement using a CSI-RS, a TRS, etc., the UE may additionally report information on an SSB capable of being received through a reception beam associated with each transmission beam to be reported.
  • the UE when the multi-beam operation is performed for a control channel and when the UE is capable of distinguishing between control information received through different beams, the UE may provide feedback information on whether the UE successfully decodes the control information.
  • the network may determine a serving beam for the UE (or perform CSI acquisition) based on the received feedback information.
  • FIG. 2 is a diagram for explaining the multi-beam operation for a control channel according to an embodiment of the present disclosure. Specifically, FIG. 2 shows transmission or repeated transmission of a control channel on multiple beams and a data channel associated with the corresponding control channel.
  • control channel is transmitted on each transmission beam for convenience of description
  • disclosure is applicable when one control channel is divided and transmitted on multiple beams.
  • the network may configure a CORESET for each transmission beam in a transmission time group and transmit the same control information in each CORESET.
  • the UE may perform blind decoding of control channels in each CORESET and then decodes a data channel using the control information included in one or multiple control channels which are successfully decoded.
  • the control information may be repeatedly transmitted on multiple transmission beams, but data may be transmitted on a single beam (e.g., a serving beam). For example, when the reception quality of transmission beam #0 is degraded, the UE may receive the control information through transmission beam #1 or #2. However, when the data is transmitted on transmission beam #0, the UE may not receive the data. In this case, the UE may attempt to receive the data, which the UE fails to receive, again through a HARQ process, etc.
  • control information in a control channel transmitted in each CORESET may indicate a different data region, and in this case, each control channel and data associated therewith may be transmitted on the same transmission beam.
  • Option 2 is advantageous in that the UE is capable of receiving both the control information and the data even when the UE successfully receives only one beam among beams in a serving beam group. However, many resources are required.
  • the UE may feed back information on control channel reception (e.g., information on a transmission and/or reception beam when the control channel reception is successful) to assist the network to determine a serving beam.
  • the feedback may be interpreted to mean that beam management is initialized or reset.
  • the UE may feed back information on a transmission beam associated with a successfully decoded control channel.
  • the transmission beam may be specified by various means such as a CORESET index, a transmission beam index, and/or CSI-RS port information.
  • the UE may report all transmission beams associated with successfully decoded control channels. Alternatively, the UE may report a transmission beam associated with a control channel with the best reception quality among the successfully decoded control channels.
  • an ACK/ACK resource may be defined for the control channel, which is transmitted on each transmission beam.
  • the ACK/NACK resource may include not only a time/frequency-domain resource but also a UE's transmission beam.
  • the network may determine a transmission beam most suitable for the UE based on the location of the ACK/NACK resource. The determination of the ACK/NACK resource and the transmission beam may be applied when the control channel is transmitted in each transmission beam as shown in FIG. 2 and data associated with the corresponding channel is transmitted.
  • the ACK/NACK resource may be implicitly or explicitly determined.
  • the ACK/NACK resource may be determined by association with resource information (e.g., a starting CCE index, a candidate index, an REG index, etc.) used for control channel transmission.
  • resource information e.g., a starting CCE index, a candidate index, an REG index, etc.
  • multiple ACK/NACK resources may be predefined or configured by higher layer signaling, and then a specific ACK/NACK resource among the ACK/NACK resources may be indicated by DCI.
  • the ACK/NACK resource may include not only a time/frequency resource but also UE's transmission beam related information.
  • the UE may determine a time/frequency resource and a UL transmission beam for transmitting the corresponding ACK/NACK based on ACK/NACK resource information.
  • the ACK/NACK resource for data may be determined by association with the transmission beam for a control channel
  • the ACK/NACK information is for the same (or one piece of) data
  • the ACK/NACK resource may be determined by the transmission beam of the control channel scheduling the corresponding data.
  • the ACK/NACK resource may be determined by the transmission beam used for transmitting control information which is successfully received, regardless of network's transmission beams used for transmitting data which is successfully received or not.
  • information on a successfully decoded transmission beam may be included and reported in ACL/NACK information for data associated with a corresponding control channel.
  • the UE may transmit information about the transmission beam of a successfully decoded PDCCH (e.g., a transmission beam index, an associated CSI-RS port, a resource index (e.g., a CCE index, a candidate index)) together with ACK/NACK information.
  • a successfully decoded PDCCH e.g., a transmission beam index, an associated CSI-RS port, a resource index (e.g., a CCE index, a candidate index)
  • the network may transmit the control channel by changing the serving beam group for the corresponding UE.
  • the change of the serving beam group may be determined by the number of times that the network fails to receive ACK/NACK information. For example, it is assumed that the network transmits a control channel using multiple beams and fails to receive ACK/NACK information therefor. If such operation is repeated more than a predetermined number of times, the network may change the serving beam group to transmit the control channel. For the change of the serving beam group, the UE may measure and report multiple serving beam groups in advance.
  • FIG. 3 is a flowchart illustrating a signal transmission and reception method according to an embodiment of the present disclosure.
  • FIG. 3 is an example for implementing the above-described embodiments, and thus, the present disclosure is not limited thereto. Redundant description will be omitted for clarity.
  • a UE measures multiple transmission beams for a PDCCH with one or two or more reception beams ( 305 ).
  • the UE determines at least one transmission beam to report to a BS based on results of measuring the multiple transmission beams (S 310 ).
  • the UE may determine to report, to the BS, a transmission beam with quality higher than a threshold.
  • the threshold may be determined depending on whether a resource for measurement is an SSB or a CSI-RS.
  • the UE transmits a measurement report including information on the determined at least one transmission beam to the BS ( 315 ).
  • the UE may identify a reception beam applied to each of the determined at least one transmission beam and report the index of an SSB available on the identified reception beam to the BS through the measurement report.
  • the measurement report may further include information on a reception beam paired with each of the determined at least one transmission beam.
  • the UE may report, to the BS, UE capability related to the number of reception beams capable of being formed simultaneously.
  • the at least one transmission beam to be reported by the UE may correspond to a transmission beam in excess of a threshold among transmission beams capable of being received through one reception beam.
  • the at least one transmission beam to be reported by the UE may include multiple transmission beam sets respectively corresponding to different reception beams.
  • the UE may receive a data signal scheduled by the PDCCH and transmit a message including ACK/NACK information for the data signal.
  • the message may further include information on a transmission beam for transmitting a PDCCH capable of being received by the UE among the multiple transmission beams.
  • FIG. 4 is a block diagram showing a structure of a base station (BS) 105 and a UE 110 in a wireless communication system 100 according to an embodiment of the present invention.
  • the structure of the BS 105 and the UE 110 of FIG. 4 are merely an embodiment of a BS and a UE for implementing the aforementioned method and the structure of a BS and a UE according to the present invention is not limited to FIG. 4 .
  • the BS 105 may also be referred to as an eNB or a gNB.
  • the UE 110 may also be referred to as a user terminal.
  • the wireless communication system 100 may include one or more BSs and/or one or more UEs.
  • the BS 105 may include a transmission (Tx) data processor 115 , a symbol modulator 120 , a transmitter 125 , a transmission/reception antenna 130 , a processor 180 , a memory 185 , a receiver 190 , a symbol demodulator 195 , and a reception (Rx) data processor 197 .
  • the UE 110 may include a Tx data processor 165 , a symbol modulator 170 , a transmitter 175 , a transmission/reception antenna 135 , a processor 155 , a memory 160 , a receiver 140 , a symbol demodulator 155 , and an Rx data processor 150 .
  • Tx transmission
  • Rx reception
  • each of the BS 105 and the UE 110 may also include a plurality of antennas as necessary. Therefore, the BS 105 and the UE 110 according to the present invention support a Multiple Input Multiple Output (MIMO) system.
  • the BS 105 according to the present invention can support both a Single User-MIMO (SU-MIMO) scheme and a Multi User-MIMO (MU-MIMO) scheme.
  • SU-MIMO Single User-MIMO
  • MU-MIMO Multi User-MIMO
  • the Tx data processor 115 receives traffic data, formats the received traffic data, codes the formatted traffic data, interleaves the coded traffic data, and modulates the interleaved data (or performs symbol mapping upon the interleaved data), such that it provides modulation symbols (i.e., data symbols).
  • the symbol modulator 120 receives and processes the data symbols and pilot symbols, such that it provides a stream of symbols.
  • the symbol modulator 120 multiplexes data and pilot symbols, and transmits the multiplexed data and pilot symbols to the transmitter 125 .
  • each transmission (Tx) symbol may be a data symbol, a pilot symbol, or a value of a zero signal (null signal).
  • pilot symbols may be successively transmitted during each symbol period.
  • the pilot symbols may be an FDM symbol, an OFDM symbol, a Time Division Multiplexing (TDM) symbol, or a Code Division Multiplexing (CDM) symbol.
  • the transmitter 125 receives a stream of symbols, converts the received symbols into one or more analog signals, and additionally adjusts the one or more analog signals (e.g., amplification, filtering, and frequency upconversion of the analog signals), such that it generates a downlink signal appropriate for data transmission through an RF channel Subsequently, the downlink signal is transmitted to the UE through the antenna 130 .
  • the one or more analog signals e.g., amplification, filtering, and frequency upconversion of the analog signals
  • the antenna 135 of the UE 110 receives a DL signal from the BS 105 , and transmits the DL signal to the receiver 140 .
  • the receiver 140 performs adjustment (e.g., filtering, amplification, and frequency downconversion) of the received DL signal, and digitizes the adjusted signal to obtain samples.
  • the symbol demodulator 145 demodulates the received pilot symbols, and provides the demodulated result to the processor 155 to perform channel estimation.
  • the symbol demodulator 145 receives a frequency response estimation value for downlink from the processor 155 , demodulates the received data symbols, obtains data symbol estimation values (indicating estimation values of the transmitted data symbols), and provides the data symbol estimation values to the Rx data processor 150 .
  • the Rx data processor 150 performs demodulation (i.e., symbol-demapping) of data symbol estimation values, deinterleaves the demodulated result, decodes the deinterleaved result, and recovers the transmitted traffic data.
  • the processing of the symbol demodulator 145 and the Rx data processor 150 is complementary to that of the symbol modulator 120 and the Tx data processor 115 in the BS 205 .
  • the Tx data processor 165 of the UE 110 processes traffic data in uplink, and provides data symbols.
  • the symbol modulator 170 receives and multiplexes data symbols, and modulates the multiplexed data symbols, such that it can provide a stream of symbols to the transmitter 175 .
  • the transmitter 175 obtains and processes the stream of symbols to generate an uplink (UL) signal, and the UL signal is transmitted to the BS 105 through the antenna 135 .
  • the transmitter and the receiver of UE/BS can be implemented as a single radio frequency (RF) unit.
  • the BS 105 receives the UL signal from the UE 110 through the antenna 130 .
  • the receiver processes the received UL signal to obtain samples.
  • the symbol demodulator 195 processes the symbols, and provides pilot symbols and data symbol estimation values received via uplink.
  • the Rx data processor 197 processes the data symbol estimation value, and recovers traffic data received from the UE 110 .
  • a processor 155 or 180 of the UE 110 or the BS 105 commands or indicates operations of the UE 110 or the BS 105 .
  • the processor 155 or 180 of the UE 110 or the BS 105 controls, adjusts, and manages operations of the UE 210 or the BS 105 .
  • Each processor 155 or 180 may be connected to a memory unit 160 or 185 for storing program code and data.
  • the memory 160 or 185 is connected to the processor 155 or 180 , such that it can store the operating system, applications, and general files.
  • the processor 155 or 180 may also be referred to as a controller, a microcontroller), a microprocessor, a microcomputer, etc.
  • the processor 155 or 180 may be implemented by various means, for example, hardware, firmware, software, or a combination thereof.
  • methods according to the embodiments of the present invention may be implemented by the processor 155 or 180 , for example, one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, etc.
  • ASICs application specific integrated circuits
  • DSPs digital signal processors
  • DSPDs digital signal processing devices
  • PLDs programmable logic devices
  • FPGAs field programmable gate arrays
  • firmware or software configuration methods according to the embodiments of the present invention may be implemented in the form of modules, procedures, functions, etc. which perform the above-described functions or operations.
  • Firmware or software implemented in the present invention may be contained in the processor 155 or 180 or the memory unit 160 or 185 , such that it can be driven by the processor 155 or 180 .
  • Radio interface protocol layers among the UE 110 , the BS 105 , and a wireless communication system can be classified into a first layer (L1 layer), a second layer (L2 layer) and a third layer (L3 layer) on the basis of the lower three layers of the Open System Interconnection (OSI) reference model widely known in communication systems.
  • a physical layer belonging to the first layer (L1) provides an information transfer service through a physical channel
  • a Radio Resource Control (RRC) layer belonging to the third layer (L3) controls radio resources between the UE and the network.
  • the UE 110 and the BS 105 may exchange RRC messages with each other through the wireless communication network and the RRC layer.
  • the present disclosure is applicable to various wireless communication systems.

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US20240063883A1 (en) * 2020-12-28 2024-02-22 Ntt Docomo, Inc. Terminal and base station
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